/**
 * 下载图片
 * @param {string}imgsrc
 * @param {string}name
 */
function downloadIamge(imgsrc, name) {
  var image = new Image();
  // 解决跨域 Canvas 污染问题
  image.setAttribute("crossOrigin", "anonymous");
  image.onload = function () {
    var canvas = document.createElement("canvas");
    canvas.width = image.width;
    canvas.height = image.height;
    var context = canvas.getContext("2d");
    context.drawImage(image, 0, 0, image.width, image.height);
    var url = canvas.toDataURL("image/png"); //得到图片的base64编码数据

    var a = document.createElement("a"); // 生成一个a元素
    var event = new MouseEvent("click"); // 创建一个单击事件
    a.download = name || "photo"; // 设置图片名称
    a.href = url; // 将生成的URL设置为a.href属性
    a.dispatchEvent(event); // 触发a的单击事件
  };
  image.src = imgsrc;
}
